lapic_shutdown() re-enables interrupts which is un-desirable for panic
case, so use local_irq_save() and local_irq_restore() to keep the irqs
disabled for kexec on panic case, and close a possible race window while
kdump shutdown as shown in this stack trace
-- BUG: spinlock lockup on CPU#1, bash/4396, c52781a0
[<c01c1870>] _raw_spin_lock+0xb7/0xd2
[<c029e148>] _spin_lock+0x6/0x8
[<c011b33f>] scheduler_tick+0xe7/0x328
[<c0128a7c>] update_process_times+0x51/0x5d
[<c0114592>] smp_apic_timer_interrupt+0x4f/0x58
[<c01141ff>] lapic_shutdown+0x76/0x7e
[<c0104d7c>] apic_timer_interrupt+0x1c/0x30
[<c01141ff>] lapic_shutdown+0x76/0x7e
[<c0116659>] machine_crash_shutdown+0x83/0xaa
[<c013cc36>] crash_kexec+0xc1/0xe3
[<c029e148>] _spin_lock+0x6/0x8
[<c013cc22>] crash_kexec+0xad/0xe3
[<c0215280>] __handle_sysrq+0x84/0xfd
[<c018d937>] write_sysrq_trigger+0x2c/0x35
[<c015e47b>] vfs_write+0xa2/0x13b
[<c015ea73>] sys_write+0x3b/0x64
[<c0103c69>] syscall_call+0x7/0xb
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
6796313263